include/uapi/linux/mic_common.h - kernel/quantenna - Git at Google

 /*
  * Intel MIC Platform Software Stack (MPSS)
  *
  * Copyright(c) 2013 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2, as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * General Public License for more details.
  *
  * The full GNU General Public License is included in this distribution in
  * the file called "COPYING".
  *
  * Intel MIC driver.
  *
  */
 #ifndef __MIC_COMMON_H_
 #define __MIC_COMMON_H_

 #include <linux/virtio_ring.h>

 #define __mic_align(a, x) (((a) + (x) - 1) & ~((x) - 1))

 /**
  * struct mic_device_desc: Virtio device information shared between the
  * virtio driver and userspace backend
  *
  * @type: Device type: console/network/disk etc.  Type 0/-1 terminates.
  * @num_vq: Number of virtqueues.
  * @feature_len: Number of bytes of feature bits.  Multiply by 2: one for
    host features and one for guest acknowledgements.
  * @config_len: Number of bytes of the config array after virtqueues.
  * @status: A status byte, written by the Guest.
  * @config: Start of the following variable length config.
  */
 struct mic_device_desc {
 	__s8 type;
 	__u8 num_vq;
 	__u8 feature_len;
 	__u8 config_len;
 	__u8 status;
 	__le64 config[0];
 } __attribute__ ((aligned(8)));

 /**
  * struct mic_device_ctrl: Per virtio device information in the device page
  * used internally by the host and card side drivers.
  *
  * @vdev: Used for storing MIC vdev information by the guest.
  * @config_change: Set to 1 by host when a config change is requested.
  * @vdev_reset: Set to 1 by guest to indicate virtio device has been reset.
  * @guest_ack: Set to 1 by guest to ack a command.
  * @host_ack: Set to 1 by host to ack a command.
  * @used_address_updated: Set to 1 by guest when the used address should be
  * updated.
  * @c2h_vdev_db: The doorbell number to be used by guest. Set by host.
  * @h2c_vdev_db: The doorbell number to be used by host. Set by guest.
  */
 struct mic_device_ctrl {
 	__le64 vdev;
 	__u8 config_change;
 	__u8 vdev_reset;
 	__u8 guest_ack;
 	__u8 host_ack;
 	__u8 used_address_updated;
 	__s8 c2h_vdev_db;
 	__s8 h2c_vdev_db;
 } __attribute__ ((aligned(8)));

 /**
  * struct mic_bootparam: Virtio device independent information in device page
  *
  * @magic: A magic value used by the card to ensure it can see the host
  * @h2c_config_db: Host to Card Virtio config doorbell set by card
  * @node_id: Unique id of the node
  * @h2c_scif_db - Host to card SCIF doorbell set by card
  * @c2h_scif_db - Card to host SCIF doorbell set by host
  * @scif_host_dma_addr - SCIF host queue pair DMA address
  * @scif_card_dma_addr - SCIF card queue pair DMA address
  */
 struct mic_bootparam {
 	__le32 magic;
 	__s8 h2c_config_db;
 	__u8 node_id;
 	__u8 h2c_scif_db;
 	__u8 c2h_scif_db;
 	__u64 scif_host_dma_addr;
 	__u64 scif_card_dma_addr;
 } __attribute__ ((aligned(8)));

 /**
  * struct mic_device_page: High level representation of the device page
  *
  * @bootparam: The bootparam structure is used for sharing information and
  * status updates between MIC host and card drivers.
  * @desc: Array of MIC virtio device descriptors.
  */
 struct mic_device_page {
 	struct mic_bootparam bootparam;
 	struct mic_device_desc desc[0];
 };
 /**
  * struct mic_vqconfig: This is how we expect the device configuration field
  * for a virtqueue to be laid out in config space.
  *
  * @address: Guest/MIC physical address of the virtio ring
  * (avail and desc rings)
  * @used_address: Guest/MIC physical address of the used ring
  * @num: The number of entries in the virtio_ring
  */
 struct mic_vqconfig {
 	__le64 address;
 	__le64 used_address;
 	__le16 num;
 } __attribute__ ((aligned(8)));

 /*
  * The alignment to use between consumer and producer parts of vring.
  * This is pagesize for historical reasons.
  */
 #define MIC_VIRTIO_RING_ALIGN		4096

 #define MIC_MAX_VRINGS			4
 #define MIC_VRING_ENTRIES		128

 /*
  * Max vring entries (power of 2) to ensure desc and avail rings
  * fit in a single page
  */
 #define MIC_MAX_VRING_ENTRIES		128

 /**
  * Max size of the desc block in bytes: includes:
  *	- struct mic_device_desc
  *	- struct mic_vqconfig (num_vq of these)
  *	- host and guest features
  *	- virtio device config space
  */
 #define MIC_MAX_DESC_BLK_SIZE		256

 /**
  * struct _mic_vring_info - Host vring info exposed to userspace backend
  * for the avail index and magic for the card.
  *
  * @avail_idx: host avail idx
  * @magic: A magic debug cookie.
  */
 struct _mic_vring_info {
 	__u16 avail_idx;
 	__le32 magic;
 };

 /**
  * struct mic_vring - Vring information.
  *
  * @vr: The virtio ring.
  * @info: Host vring information exposed to the userspace backend for the
  * avail index and magic for the card.
  * @va: The va for the buffer allocated for vr and info.
  * @len: The length of the buffer required for allocating vr and info.
  */
 struct mic_vring {
 	struct vring vr;
 	struct _mic_vring_info *info;
 	void *va;
 	int len;
 };

 #define mic_aligned_desc_size(d) __mic_align(mic_desc_size(d), 8)

 #ifndef INTEL_MIC_CARD
 static inline unsigned mic_desc_size(const struct mic_device_desc *desc)
 {
 	return sizeof(*desc) + desc->num_vq * sizeof(struct mic_vqconfig)
 		+ desc->feature_len * 2 + desc->config_len;
 }

 static inline struct mic_vqconfig *
 mic_vq_config(const struct mic_device_desc *desc)
 {
 	return (struct mic_vqconfig *)(desc + 1);
 }

 static inline __u8 *mic_vq_features(const struct mic_device_desc *desc)
 {
 	return (__u8 *)(mic_vq_config(desc) + desc->num_vq);
 }

 static inline __u8 *mic_vq_configspace(const struct mic_device_desc *desc)
 {
 	return mic_vq_features(desc) + desc->feature_len * 2;
 }
 static inline unsigned mic_total_desc_size(struct mic_device_desc *desc)
 {
 	return mic_aligned_desc_size(desc) + sizeof(struct mic_device_ctrl);
 }
 #endif

 /* Device page size */
 #define MIC_DP_SIZE 4096

 #define MIC_MAGIC 0xc0ffee00

 /**
  * enum mic_states - MIC states.
  */
 enum mic_states {
 	MIC_READY = 0,
 	MIC_BOOTING,
 	MIC_ONLINE,
 	MIC_SHUTTING_DOWN,
 	MIC_RESETTING,
 	MIC_RESET_FAILED,
 	MIC_LAST
 };

 /**
  * enum mic_status - MIC status reported by card after
  * a host or card initiated shutdown or a card crash.
  */
 enum mic_status {
 	MIC_NOP = 0,
 	MIC_CRASHED,
 	MIC_HALTED,
 	MIC_POWER_OFF,
 	MIC_RESTART,
 	MIC_STATUS_LAST
 };

 #endif
	/*
	* Intel MIC Platform Software Stack (MPSS)
	*
	* Copyright(c) 2013 Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2, as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* The full GNU General Public License is included in this distribution in
	* the file called "COPYING".
	*
	* Intel MIC driver.
	*
	*/
	#ifndef __MIC_COMMON_H_
	#define __MIC_COMMON_H_

	#include <linux/virtio_ring.h>

	#define __mic_align(a, x) (((a) + (x) - 1) & ~((x) - 1))

	/**
	* struct mic_device_desc: Virtio device information shared between the
	* virtio driver and userspace backend
	*
	* @type: Device type: console/network/disk etc. Type 0/-1 terminates.
	* @num_vq: Number of virtqueues.
	* @feature_len: Number of bytes of feature bits. Multiply by 2: one for
	host features and one for guest acknowledgements.
	* @config_len: Number of bytes of the config array after virtqueues.
	* @status: A status byte, written by the Guest.
	* @config: Start of the following variable length config.
	*/
	struct mic_device_desc {
	__s8 type;
	__u8 num_vq;
	__u8 feature_len;
	__u8 config_len;
	__u8 status;
	__le64 config[0];
	} __attribute__ ((aligned(8)));

	/**
	* struct mic_device_ctrl: Per virtio device information in the device page
	* used internally by the host and card side drivers.
	*
	* @vdev: Used for storing MIC vdev information by the guest.
	* @config_change: Set to 1 by host when a config change is requested.
	* @vdev_reset: Set to 1 by guest to indicate virtio device has been reset.
	* @guest_ack: Set to 1 by guest to ack a command.
	* @host_ack: Set to 1 by host to ack a command.
	* @used_address_updated: Set to 1 by guest when the used address should be
	* updated.
	* @c2h_vdev_db: The doorbell number to be used by guest. Set by host.
	* @h2c_vdev_db: The doorbell number to be used by host. Set by guest.
	*/
	struct mic_device_ctrl {
	__le64 vdev;
	__u8 config_change;
	__u8 vdev_reset;
	__u8 guest_ack;
	__u8 host_ack;
	__u8 used_address_updated;
	__s8 c2h_vdev_db;
	__s8 h2c_vdev_db;
	} __attribute__ ((aligned(8)));

	/**
	* struct mic_bootparam: Virtio device independent information in device page
	*
	* @magic: A magic value used by the card to ensure it can see the host
	* @h2c_config_db: Host to Card Virtio config doorbell set by card
	* @node_id: Unique id of the node
	* @h2c_scif_db - Host to card SCIF doorbell set by card
	* @c2h_scif_db - Card to host SCIF doorbell set by host
	* @scif_host_dma_addr - SCIF host queue pair DMA address
	* @scif_card_dma_addr - SCIF card queue pair DMA address
	*/
	struct mic_bootparam {
	__le32 magic;
	__s8 h2c_config_db;
	__u8 node_id;
	__u8 h2c_scif_db;
	__u8 c2h_scif_db;
	__u64 scif_host_dma_addr;
	__u64 scif_card_dma_addr;
	} __attribute__ ((aligned(8)));

	/**
	* struct mic_device_page: High level representation of the device page
	*
	* @bootparam: The bootparam structure is used for sharing information and
	* status updates between MIC host and card drivers.
	* @desc: Array of MIC virtio device descriptors.
	*/
	struct mic_device_page {
	struct mic_bootparam bootparam;
	struct mic_device_desc desc[0];
	};
	/**
	* struct mic_vqconfig: This is how we expect the device configuration field
	* for a virtqueue to be laid out in config space.
	*
	* @address: Guest/MIC physical address of the virtio ring
	* (avail and desc rings)
	* @used_address: Guest/MIC physical address of the used ring
	* @num: The number of entries in the virtio_ring
	*/
	struct mic_vqconfig {
	__le64 address;
	__le64 used_address;
	__le16 num;
	} __attribute__ ((aligned(8)));

	/*
	* The alignment to use between consumer and producer parts of vring.
	* This is pagesize for historical reasons.
	*/
	#define MIC_VIRTIO_RING_ALIGN 4096

	#define MIC_MAX_VRINGS 4
	#define MIC_VRING_ENTRIES 128

	/*
	* Max vring entries (power of 2) to ensure desc and avail rings
	* fit in a single page
	*/
	#define MIC_MAX_VRING_ENTRIES 128

	/**
	* Max size of the desc block in bytes: includes:
	* - struct mic_device_desc
	* - struct mic_vqconfig (num_vq of these)
	* - host and guest features
	* - virtio device config space
	*/
	#define MIC_MAX_DESC_BLK_SIZE 256

	/**
	* struct _mic_vring_info - Host vring info exposed to userspace backend
	* for the avail index and magic for the card.
	*
	* @avail_idx: host avail idx
	* @magic: A magic debug cookie.
	*/
	struct _mic_vring_info {
	__u16 avail_idx;
	__le32 magic;
	};

	/**
	* struct mic_vring - Vring information.
	*
	* @vr: The virtio ring.
	* @info: Host vring information exposed to the userspace backend for the
	* avail index and magic for the card.
	* @va: The va for the buffer allocated for vr and info.
	* @len: The length of the buffer required for allocating vr and info.
	*/
	struct mic_vring {
	struct vring vr;
	struct _mic_vring_info *info;
	void *va;
	int len;
	};

	#define mic_aligned_desc_size(d) __mic_align(mic_desc_size(d), 8)

	#ifndef INTEL_MIC_CARD
	static inline unsigned mic_desc_size(const struct mic_device_desc *desc)
	{
	return sizeof(desc) + desc->num_vq sizeof(struct mic_vqconfig)
	+ desc->feature_len * 2 + desc->config_len;
	}

	static inline struct mic_vqconfig *
	mic_vq_config(const struct mic_device_desc *desc)
	{
	return (struct mic_vqconfig *)(desc + 1);
	}

	static inline __u8 mic_vq_features(const struct mic_device_desc desc)
	{
	return (__u8 *)(mic_vq_config(desc) + desc->num_vq);
	}

	static inline __u8 mic_vq_configspace(const struct mic_device_desc desc)
	{
	return mic_vq_features(desc) + desc->feature_len * 2;
	}
	static inline unsigned mic_total_desc_size(struct mic_device_desc *desc)
	{
	return mic_aligned_desc_size(desc) + sizeof(struct mic_device_ctrl);
	}
	#endif

	/* Device page size */
	#define MIC_DP_SIZE 4096

	#define MIC_MAGIC 0xc0ffee00

	/**
	* enum mic_states - MIC states.
	*/
	enum mic_states {
	MIC_READY = 0,
	MIC_BOOTING,
	MIC_ONLINE,
	MIC_SHUTTING_DOWN,
	MIC_RESETTING,
	MIC_RESET_FAILED,
	MIC_LAST
	};

	/**
	* enum mic_status - MIC status reported by card after
	* a host or card initiated shutdown or a card crash.
	*/
	enum mic_status {
	MIC_NOP = 0,
	MIC_CRASHED,
	MIC_HALTED,
	MIC_POWER_OFF,
	MIC_RESTART,
	MIC_STATUS_LAST
	};

	#endif